کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
682345 888982 2011 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Role of extracellular polymeric substances in Cu(II) adsorption on Bacillus subtilis and Pseudomonas putida
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تکنولوژی و شیمی فرآیندی
پیش نمایش صفحه اول مقاله
Role of extracellular polymeric substances in Cu(II) adsorption on Bacillus subtilis and Pseudomonas putida
چکیده انگلیسی

The effect of extracellular polymeric substances (EPS) of Gram-positive Bacillus subtilis and Gram-negative Pseudomonas putida on Cu(II) adsorption was investigated using a combination of batch adsorption, potentiometric titrations, Fourier transform infrared spectroscopy. Both the potentiometric titrations and the Cu(II) adsorption experiments indicated that the presence of EPS in a biomass sample significantly enhance Cu(II) adsorption capacity. Surface complexation modeling showed that the pKa values for the three functional groups (carboxyl, phosphate and hydroxyl) were very similar for untreated and EPS-free cells, indicating no qualitative difference in composition. However, site concentrations on the untreated cell surface were found to be significantly higher than those on the EPS-free cell surface. Infrared analysis provided supporting evidence and demonstrated that carboxyl and phosphate groups are responsible for Cu(II) adsorption on the native and EPS-free cells.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Bioresource Technology - Volume 102, Issue 2, January 2011, Pages 1137–1141
نویسندگان
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